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See detailCompaction of anisotropic granular materials: Experiments and simulations
Lumay, Geoffroy ULg; Vandewalle, Nicolas ULg

in Physical Review E (2004), 70(5, Pt 1), 51314

We present both experimental and numerical investigations of compaction in granular materials composed of rods. As a function of the particles size and with respect to the container diameter, we have ... [more ▼]

We present both experimental and numerical investigations of compaction in granular materials composed of rods. As a function of the particles size and with respect to the container diameter, we have observed large variations of the asymptotic packing volume fraction. The relevant parameter is the ratio between the rod length l and the tube diameter D. Even the compaction dynamics remains unchanged for various particle lengths, and a transition between 3d and 2d ordering for grain orientations is observed for l/D= 1. A toy model for the compaction of needles on a lattice is also proposed. This toy model gives a complementary view of our experimental results and leads to behaviors similar to experimental ones. [less ▲]

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See detailCompaction of granular materials: experiments and contact dynamics simulations
Lumay, Geoffroy ULg; Ludewig, François ULg; Vandewalle, Nicolas ULg

in Journal of Physics: Conference Series (2006), 40

We present an original experimental study of the slow compaction dynamics for two- dimensional isotropic granular systems. Compaction dynamics is measured at three different scales : the macroscopic scale ... [more ▼]

We present an original experimental study of the slow compaction dynamics for two- dimensional isotropic granular systems. Compaction dynamics is measured at three different scales : the macroscopic scale through the normalized packing fraction ˜ ρ, the mesoscopic scale through the normalized fraction ˜ φ of domains ideally ordered in the system, and the microscopic scale through the grain mobility μ. The domains ideally ordered are found to obey a growth process dominated by the displacement of domain boundaries. We present also preliminary results of three-dimensional simulations with a model of contact dynamics. These results allow to discuss the difference between the two-dimensional and the three-dimensional cases. [less ▲]

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See detailCompaction of granular mixtures
Ludewig, François ULg; Vandewalle, Nicolas ULg; Dorbolo, Stéphane ULg

in Granular Matter (2006), 8(2), 87-91

We propose a lattice model for studying the compaction of granular mixtures under taps. Two granular species are considered: small grains with low mobilities and T-shaped grains characterized by a larger ... [more ▼]

We propose a lattice model for studying the compaction of granular mixtures under taps. Two granular species are considered: small grains with low mobilities and T-shaped grains characterized by a larger ability to move. When those grains are mixed together, the compaction dynamics is mainly controlled by the volume fraction x of the small grains. Segregation have been found on the top layers of the pile. The grain mobilities have been studied for different values of the volume fraction x. An effective grain mobility has been defined for the mixture. This mobility is given by the linear combination of the mobility of both pure species minus a non-linear interaction term. Finally, the compaction speed depends on the fraction of the anisotropic grains. [less ▲]

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See detailCompactly supported wavelets in Sobolev spaces of integer order
Bastin, Françoise ULg; Laubin, P.

in Applied & Computational Harmonic Analysis (1997), 4(1), 51-57

We present a construction of regular compactly supported wavelets in any Sobolev space of integer order. It is based on the existence and suitable estimates of filters defined from polynomial equations ... [more ▼]

We present a construction of regular compactly supported wavelets in any Sobolev space of integer order. It is based on the existence and suitable estimates of filters defined from polynomial equations. We give an implicit study of these filters and use the results obtained to construct scaling functions leading to multiresolution analysis and wavelets. Their regularity increases linearly with the length of their supports as in the L(2) case. One technical problem is to prove that the intersection of the scaling spaces is reduced to 0. This is solved using sharp estimates of Littlewood-Paley type. (C) 1997 Academic Press, Inc. [less ▲]

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See detailLa Compagnie de Jésus à Liège. Aperçu historique
Delfosse, Annick ULg

in Revue Liégeoise de la Société de Musicologie (2008), 27

Historical presentation of the Jesuit schools story in the city of Liege and the Gallo-Belgian Province. Focus on the issues concerning the theatre and the solemn processions.

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See detailLa Compagnie de Jésus et Notre-Dame de Foy. Diffusion, appropriation, évangélisation
Delfosse, Annick ULg

in Dekoninck, Ralph; Delfosse, Annick; Pacco, Christian (Eds.) Foy Notre-Dame : Art, Politique et Religion. Actes du colloque de Dinant (16 mai 2009) (2009)

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See detailCompagnies d’aventure et armées françaises. Le cas des campagnes de Gênes et de Naples à l’époque du Grand Schisme d’Occident
Masson, Christophe ULg

in Pépin, Guilhem; Lainé, Françoise; Boutoulle, Frédéric (Eds.) Routiers et mercenaires pendant la guerre de Cent ans. Hommage à Jonathan Sumption. Actes du colloque de Berbiguières (13–14 septembre 2013) (2016)

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See detailCompanion search around β Pictoris with the newly commissioned L'-band vector vortex coronagraph on VLT/NACO
Mawet, D.; Absil, Olivier ULg; Milli, J. et al

in Booth, Mark; Matthews, Brenda; Graham, James (Eds.) Exploring the Formation and Evolution of Planetary Systems (2014, January 01)

Here we present the installation and successful commissioning of an L'-band Annular Groove Phase Mask (AGPM) coronagraph on VLT/NACO. The AGPM is a vector vortex coronagraph made from diamond ... [more ▼]

Here we present the installation and successful commissioning of an L'-band Annular Groove Phase Mask (AGPM) coronagraph on VLT/NACO. The AGPM is a vector vortex coronagraph made from diamond subwavelength gratings tuned to the L' band. The vector vortex coronagraph enables high contrast imaging at very small inner working angle (here 0''.09, the diffraction limit of the VLT at L'), potentially being the key to a new parameter space. During technical and science verification runs, we discovered a late-type companion at two beamwidths from an F0V star (Mawet et al. 2013), and imaged the inner regions of β Pictoris down to the previously unexplored projected radius of 1.75 AU. The circumstellar disk was also resolved from ~= 1'' to 5'' (see J. Milli et al., these proceedings). These results showcase the potential of the NACO L-band AGPM over a wide range of spatial scales. [less ▲]

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See detailComparable transplant outcomes between DBD and DCD kidney grafts up to 5 years post-transplant: single centre experience
Ledinh, H; DETRY, Olivier ULg; DE ROOVER, Arnaud ULg et al

in Transplant International (2015, November), 28(S4), 193-194188

Introduction: This study aimed to determine the most recent results of kidney transplantation (KT) from donation after brain death (DBD) and circulatory death (DCD). Primary endpoints were graft and ... [more ▼]

Introduction: This study aimed to determine the most recent results of kidney transplantation (KT) from donation after brain death (DBD) and circulatory death (DCD). Primary endpoints were graft and patient survival, and graft function. Acute rejection and post-operative complications were assessed as secondary endpoints. Patient and Methods: This retrospective mono-center review consisted of 226 DBD- and 104 DCD-KT between 2008 and 2014. Results: Graft survival was comparable between two groups (95.1 vs. 91.1% at 1 year, 92.8 vs. 91.1% at 3 years and 89.2 vs. 91.1% at 5 years). 46% and 40% of graft loss were attributed to patient death with a functioning graft and rejection. Patient survival was comparable between 2 groups (97.8 vs. 95.1% at 1 year, 94.1 vs. 91.2% at 3 years, and 89.6 vs. 82.3% at five years). Etiology of patient death included cardiac arrest (16.7%), infection (16.7%), cancer (13.3%), and unknown cause (46.7%). Delayed graft function occurred in 14.6% of DBD- and 30.8% of DCD-KT (p = 0.001). Primary non function was encountered in 2.6% DBD- and 4.8% DCD-KT (p = ns). Graft function was worse in DCD than DBD up to 3 months post-transplant (p = 0.034), however, no difference existed afterwards. Biopsy-proven acute rejection was found in 12.8% and 13.5% of DBD- and DCD-KT during an average 3 months post- transplant (p = ns). This rate was 7.1% vs. 8.9% on surveillance biopsy performed between 3 and 6 months post-transplant (p = ns). Post-operativecomplication rate was comparable between 2 groups, concerning patient death, reoperation, transfusion, perirenal hematoma, macroscopic hematuria, urinary obstruction, wound problem, and infection. Nevertheless, contamination of preservation solution occurred more commonly in DCD than DBD (0.4% vs. 3.8%, p = 0.036). Conclusions: Despite worse early graft function, DCD-KT was not inferior to that originating from DBD up to 5 years post-transplant, therefore deserves to be used. [less ▲]

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See detailComparacion de la forma de la arcada dental antes y despues de la nivelacion via el programa APS
LEWY, Stéphanie; LIMME, Michel ULg; BRUWIER, Annick ULg

Poster (2014, September)

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See detailComparaison avec les autres méthodes de mesure (au cabinet, MAPA)
Krzesinski, Jean-Marie ULg

Conference (2009, February 07)

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See detailComparaison between Numerical and Experimental Results in Study of Offshore Structure Movements
Marchal, Jean ULg; Lejeune, A.; Hoffay, T. et al

in Proceeding of the Int. Conf. Washington D.C. (1982)

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See detailComparaison d'efficacite contre le Ditylenchus dipsaci (Kuehn) Fil. de 4 traitements nematicides incorpores aux enrobages de semences de feverole (Vicia faba L.).
Schiffers, Bruno ULg; Fraselle, J.; Jaumin, Luc ULg

in Mededelingen van de Faculteit Landbouwwetenschappen Rijksuniversiteit Gent (1985), 50(3a), 797-807

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See detailComparaison d'efficacite de 22 insecticides de contact pour la lutte contre la cochenille pulvinaire (Eupulvinaria hydrangeae Steinweiden).
Tondeur, R.; Schiffers, Bruno ULg; Verstraeten, C.

in Mededelingen van de Faculteit Landbouwwetenschappen (Rijksuniversiteit te Gent) (1990), 55(2b),

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See detailComparaison d'efficacité de cinq pyréthrinoïdes à l'égard de six insectes ravageurs des denrées entreposées
Schiffers, Bruno ULg; Fraselle, Joseph; Haubruge, Eric ULg et al

in Med. Fac. Landbouw Rijksuniv. Gent (1989)

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See detailComparaison d'huile moteur ACEA E3 et ACEA E4 sur des bus: Hypothèses de travail et interprétation des résultats
Novak, Marie Hélène; Engalytcheff, A.; Etienne, J.-P. et al

Report (2003)

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See detailComparaison d’un modèle empirique et d’un modèle physique de séchage de grains de maïs en lit fluidisé
Janas, Sébastien ULg; Malumba Kamba, Paul ULg; Deroanne, Claude et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2010), 14(3), 389-398

Dans cet article, deux modèles prévisionnels de la température et de la teneur en eau de grains de maïs durant leur séchage en lit fluidisé sont comparés. Le premier modèle est un modèle empirique, où les ... [more ▼]

Dans cet article, deux modèles prévisionnels de la température et de la teneur en eau de grains de maïs durant leur séchage en lit fluidisé sont comparés. Le premier modèle est un modèle empirique, où les phénomènes physiques impliqués dans le processus ne sont pas décrits. Ses équations peuvent être résolues à l’aide de logiciels gratuits disponibles sur Internet. Le second est un modèle plus complexe, basé sur les lois physiques régissant les transferts de chaleur et de masse au sein du produit. Sa résolution nécessite l’utilisation de logiciels commerciaux de calcul par éléments finis. Les deux modèles sont paramétrés sur des séchages à température constante, puis validés sur des séchages à température variable et un séchage discontinu. Les deux modèles permettent de décrire avec une précision acceptable les évolutions de teneurs en eau au cours des séchages continus et de prévoir les évolutions de teneurs en eau lors des séchages à température variable et du séchage discontinu. Le modèle empirique ne permet pas de décrire l’évolution de la température des grains lors de séchages à température variable avec une précision meilleure qu’1 °C. Si cette précision est suffisante, l’exploitation du modèle empirique permettra de réduire considérablement les couts en temps et en licence de logiciels pour la modélisation du séchage du maïs en lit fluidisé. [less ▲]

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See detailComparaison d'une méthode "acide" et enzymatique pour le dosage de l'inuline
Thibaudin, L.; Delanaye, Pierre ULg; Maillard, N. et al

Poster (2010, September)

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